What does a file with an .RPT file contain?
In most cases, RPT stands for report. A file with a RPT file extension will likely contain some report data.
RPT files are often created by some version of SAP Crystal Reports, though it may simply contain ASCII text data, or it may be created by some other company and contain some other proprietary report format.
If your .RPT files are created using SAP Crystal Reports, you can view the contents of the file using The Report Viewer.
If your .RPT file is simply ASCII text, you can view it using Microsoft's Notepad, or some other text editor.